Individual study: Usage of new versus previously used nest boxes by rollers Coracias garrulus in the Serena region, Extremadura, Spain
Avilés J.M., Sanchez J.M. & Parejo D. (2000) The roller Coracias garrulus in Extremadura (southwestern Spain) does not show a preference for breeding in clean nestboxes. Bird Study, 47, 252-254
This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.
Provide artificial nesting sites for rollers
A replicated, controlled study in pastureland in 1989-90 in Extramadura, Spain (Avilés et al. 2000), found that European rollers Coracias garrulus nesting in new nest boxes did not have higher reproductive success than those nesting in older nest boxes (average of 4.3 eggs/clutch, 69% breeding success and 4.0 fledglings/successful nest for 16 pairs in old boxes vs. 4.1 eggs/clutch, 83% and 3.6 fledglings/nest for 49 pairs in new boxes) and began laying significantly later (average laying date of 25th May for clutches in 16 old boxes vs. 30th May for 49 new boxes). Rollers did not appear to preferentially use either old or new boxes. Boxes were 32 x 18 x 19 cm with a 6 x 18 cm entrance hole and were installed on power line pylons at an average density of 9.5 boxes/km of power line.